I hear the best way to diffuse essential oil is just by leaving it be. Without heating it. This little thingy does just that. You drip some drops in the little dent & it spreads trough the air without losing any of its healthy powers. I love the smell of pure essential oil in my house.
Fired once instead of the usual two firings to leave it more porous for the oil.
This essential oil diffuser is thrown on the wheel in a stoneware clay.